Mercury MerCruiser MCM 4.3LH BRAVO User Manual

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MAINTENANCESERVICE MANUAL NUMBER 25
90-861328--1 NOVEMBER 1999 Page 1B-1
IMPORTANT INFORMATION
Section 1B - Maintenance
Table of Contents
Tools 1B-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lubricants / Sealants / Adhesives 1B-2. . . . .
Maintenance Schedules 1B-3. . . . . . . . . . . . . .
Maintenance Intervals 1B-3. . . . . . . . . . . . .
Gas Sterndrive 1B-3. . . . . . . . . . . . . . . . . . . . . .
Routine Maintenance * 1B-3. . . . . . . . . . . .
Scheduled Maintenance * 1B-4. . . . . . . . . .
Engine and Tune-Up Specifications 1B-5. . . .
MCM (Sterndrive) 1B-5. . . . . . . . . . . . . . . . .
Fluid Capacities 1B-6. . . . . . . . . . . . . . . . . . . . .
Sterndrive Engines 1B-6. . . . . . . . . . . . . . .
Sterndrives 1B-6. . . . . . . . . . . . . . . . . . . . . .
20-Hour Break-In Period 1B-7. . . . . . . . . . . . .
After Break-in Period 1B-7. . . . . . . . . . . . . . . .
End of First Season Checkup 1B-7. . . . . . . . .
Specifications 1B-8. . . . . . . . . . . . . . . . . . . . . . .
Fuel Recommendations 1B-8. . . . . . . . . . .
Test For Alcohol Content In Gasoline 1B-10
Power Steering Fluid 1B-10. . . . . . . . . . . . . . . .
Coolant for Closed Cooling System 1B-10. . . .
Crankcase Oil 1B-11. . . . . . . . . . . . . . . . . . . . . .
Overfilled Crankcase Oil 1B-11. . . . . . . . . . .
Checking Engine Oil Level / Filling 1B-12. .
Changing Oil and Filter 1B-12. . . . . . . . . . . . . . .
Changing Water Separating Fuel Filter 1B-13.
Power Steering System 1B-15. . . . . . . . . . . . . .
Checking Fluid Level 1B-15. . . . . . . . . . . . . .
Engine Cold 1B-15. . . . . . . . . . . . . . . . . . . . .
Filling and Bleeding 1B-16. . . . . . . . . . . . . . .
Closed Cooling System 1B-17. . . . . . . . . . . . . .
Checking Coolant Level 1B-17. . . . . . . . . . .
Flushing System 1B-18. . . . . . . . . . . . . . . . . .
Lubrication 1B-20. . . . . . . . . . . . . . . . . . . . . . . . .
Throttle Cable 1B-20. . . . . . . . . . . . . . . . . . . .
Shift Cable 1B-20. . . . . . . . . . . . . . . . . . . . . . .
Engine Coupler /
U-Joint Shaft Splines 1B-21. . . . . . . . . . . . .
Sterndrive Drive
Shaft Extension Models 1B-22. . . . . . . . . . .
Cleaning Flame Arrestor 1B-22. . . . . . . . . . . . .
Top Mounted Flame Arrestor 1B-23. . . . . . .
Serpentine Drive Belt 1B-23. . . . . . . . . . . . . . . .
Component Location 1B-23. . . . . . . . . . . . . .
Serpentine Belt Routing 1B-24. . . . . . . . . . . . . .
S/N 0L619083 and Below 1B-24. . . . . . . . . .
S/N 0L619084 and Above 1B-25. . . . . . . . .
Inspection 1B-26. . . . . . . . . . . . . . . . . . . . . . .
Replacing and/or Adjusting Tension 1B-26.
Ignition Timing 1B-27. . . . . . . . . . . . . . . . . . . . . .
Thunderbolt V Models 1B-27. . . . . . . . . . . . .
EFI 1B-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Cold Weather or Extended Storage 1B-29. . . .
Precautions 1B-29. . . . . . . . . . . . . . . . . . . . . .
Power Package Layup 1B-31. . . . . . . . . . . .
Draining Instructions 1B-33. . . . . . . . . . . . . .
Draining Sterndrive 1B-38. . . . . . . . . . . . . . .
Recommissioning 1B-39. . . . . . . . . . . . . . . . .

Mercury MerCruiser MCM 4.3LH BRAVO Specifications

General

Engine Type	V6
Drive Unit	BRAVO
Compression Ratio	9.4:1
Cooling System	Raw water cooled
Displacement	4.3L (262 CID)
Bore x Stroke	4.00 x 3.48 in (101.6 x 88.4 mm)
Ignition System	Electronic
Alternator	65 amp
Gear Ratio	1.81:1
Recommended Oil	SAE 25W-40
Fuel Requirement	87 Octane

Summary

Maintenance Schedules and Specifications

Maintenance Intervals

Details on service frequency and tasks for marine engines.

Engine and Tune-Up Specifications

Performance data and tuning parameters for MCM engines.

Fluid Capacities and Fuel Handling

Fluid Capacities

Lists oil and coolant capacities for engines and sterndrives.

Fuel Recommendations

Guidelines on acceptable gasoline types and octane ratings.

Gasohol Handling

Adverse effects and precautions for using gasohol in engines.

Engine Oil, Filter, and Power Steering Service

Crankcase Oil Service

Procedures for checking, filling, and changing engine oil.

Power Steering System

Maintenance procedures for the power steering system.

Cooling System and Fuel Filter Maintenance

Changing Water Separating Fuel Filter

Steps to replace the water separating fuel filter.

Cooling System Maintenance

Procedures for coolant checks and flushing the system.

Component, Belt, and Ignition Maintenance

Sterndrive Component Maintenance

Greasing and cleaning sterndrive components like flame arrestors.

Serpentine Drive Belt

Inspection and adjustment of the serpentine drive belt.

Ignition Timing

How to check and adjust ignition timing on Thunderbolt V models and EFI.

Storage, Winterization, and Recommissioning

Cold Weather or Extended Storage

Important precautions for winterizing and storing the engine.

Power Package Layup

Steps for preparing the power package for storage.

Draining Instructions

Procedures for draining cooling systems for winterization.

Recommissioning

Steps to prepare the engine after storage.